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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 16,164,841	$ 15,406,572
Fixed maturity securities - available for sale, Market Value	16,566,133	15,225,263
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Due in one year or less, Amortized Cost	1,430,361	1,328,571
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	6,639,678	8,114,247
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	3,117,529	2,455,911
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	1,008,863	789,575
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,444,393	1,330,534
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	6,750,145	8,016,490
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	3,274,937	2,413,846
Fixed maturity securities - available for sale, Due after ten years, Market Value	1,054,797	791,113
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	864,311	545,427
Fixed maturity securities - available for sale, Market Value	864,886	540,097
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	728,348	329,883
Fixed maturity securities - available for sale, Market Value	767,292	326,710
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,367,704	1,832,760
Fixed maturity securities - available for sale, Market Value	2,401,616	1,796,264
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	8,047	10,198
Fixed maturity securities - available for sale, Market Value	$ 8,067	$ 10,209

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